[backend] Fix dashboard export failing with dynamicRegardingOf filters (#14539, #14527)

[SamuelHassine]

Summary

• Fixes Dashboard: Export fails when a widget contains a dynamic "in regard of" filter #14527 - Dashboard export fails silently when a widget contains a dynamic in regard of filter
• Fixes Dashboard configuration export (JSON) fails with INTERNAL_SERVER_ERROR: "Expected a string but received a Object" #14539 - Dashboard configuration export (JSON) fails with INTERNAL_SERVER_ERROR: Expected a string but received a Object

Root Cause

The extractFiltersIds and replaceFiltersIds functions in workspace-utils.ts only handled the regardingOf filter key when processing nested subfilter objects (whose values are { key, values } objects rather than plain strings). The dynamicRegardingOf filter has the same nested structure but was not handled, causing the code to pass these objects directly to isInternalId() / isUUID(), which expects a string - resulting in TypeError: Expected a string but received a Object.

Changes

workspace-utils.ts:

• Added import for INSTANCE_DYNAMIC_REGARDING_OF
• Introduced isRegardingOfKey() helper to check for both regardingOf and dynamicRegardingOf filter keys
• Updated extractFiltersIds to handle dynamicRegardingOf subfilters (including recursive extraction from the dynamic subfilter's nested FilterGroup values)
• Updated replaceFiltersIds to handle dynamicRegardingOf subfilters (including recursive ID replacement in nested FilterGroup values and preservation of the dynamic subfilter)

workspace-utils-test.ts:

• Added test for dynamicRegardingOf with ID subfilter + dynamic nested FilterGroup (verifies both ID remapping layers)
• Added test for dynamicRegardingOf without ID subfilter (edge case where only relationship_type + dynamic are present)

Test plan

• Existing test should convert widget filters ids still passes (no regression on regardingOf)
• New test should convert widget filters ids with dynamicRegardingOf passes
• New test should convert widget filters ids with dynamicRegardingOf without id subfilter passes
• Manual: Create dashboard with In regard of (dynamic) widget filter, export dashboard -> JSON file downloads
• Manual: Export individual widget with In regard of (dynamic) filter -> JSON file downloads
• Manual: Import the exported dashboard on another instance -> filter structure preserved

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 32.38%. Comparing base (15b4e5a) to head (2d83e2e).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #14858   +/-   ##
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  Coverage   32.37%   32.38%           
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  Files        3111     3111           
  Lines      211860   211882   +22     
  Branches    38414    38421    +7     
=======================================
+ Hits        68594    68613   +19     
- Misses     143266   143269    +3     

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opencti-front	2.82% <ø> (ø)
opencti-graphql	67.60% <100.00%> (+<0.01%)	⬆️

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